System-Fitness-Advisor-skill

Use when the user invokes /fitness, $system-fitness-advisor, or asks for systematic fitness planning, long-term user fitness data storage, initial profile intake, workout-log or screenshot analysis, nutrition log analysis tied to training, training-plan modification, exercise substitution, or programming across hypertrophy splits, fat-loss/recomposition, body-part specialization, strength, or powerlifting. Avoid for medical diagnosis, unrelated nutrition-only lookup, or non-training creative tasks.